US9839044B2 - Radio base station and mobile station - Google Patents

Radio base station and mobile station Download PDF

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Publication number
US9839044B2
US9839044B2 US14/781,067 US201414781067A US9839044B2 US 9839044 B2 US9839044 B2 US 9839044B2 US 201414781067 A US201414781067 A US 201414781067A US 9839044 B2 US9839044 B2 US 9839044B2
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Prior art keywords
base station
radio base
priority
priority control
bearer
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US14/781,067
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US20160050682A1 (en
Inventor
Tooru Uchino
Hideaki Takahashi
Akihito Hanaki
Kenichiro Aoyagi
Wuri Andarmawanti Hapsari
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AOYAGI, KENICHIRO, HANAKI, AKIHITO, HAPSARI, WURI ANDARMAWANTI, TAKAHASHI, HIDEAKI, UCHINO, Tooru
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Priority to US15/800,251 priority Critical patent/US10893530B2/en
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    • H04W72/10—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2425—Traffic characterised by specific attributes, e.g. priority or QoS for supporting services specification, e.g. SLA
    • H04L47/2433—Allocation of priorities to traffic types
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W76/02—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • the present invention relates to a radio base station and a mobile station.
  • priority control is performed in such a manner that a bearer (LCH: Logical Channel) is established for each QCI (QoS Class Identifier) and a priority (Logical Channel Priority) is assigned to each bearer.
  • LCH Logical Channel
  • data sets in the same bearer are deemed to have the same priority.
  • the priority control is performed both in a radio base station eNB and a mobile station UE.
  • the MAC layer is in charge of priority control in a radio access network.
  • the MAC layer of a radio base station eNB is configured to decide the order of data sets to be transmitted to a radio bearer, based on priorities assigned to respective bearers.
  • the “UPCON WI” defines a “FPI (Flow Priority Indicator)” indicating the priority of each data flow (IP flow) for more detailed priority control, and discusses solving means for (a scheduler of) the radio base station eNB to carryout the QoS control and priority control using the FPI.
  • FPI Flow Priority Indicator
  • the configuration of a radio access network in the current LTE systems has a problem in that, because neither the radio base station eNB nor the mobile station UE takes into consideration of FPIs, priority control using FPIs cannot be performed as illustrated in FIG. 8 .
  • the present invention has been therefore made in view of the above circumstances and an objective thereof is to provide a radio base station and a mobile station which can perform priority control using FPIs.
  • a first feature of the present invention is summarized as a radio base station including: a bearer management unit configured to manage flow priorities assigned to data flows received from a core network device via an S1 bearer; and a priority control unit configured to perform priority control over the data flows received from the core network device via the S1 bearer.
  • the bearer management unit establishes a radio bearer with a mobile station for each of the flow priorities, and the priority control unit transfers each data flow received from the core network device via the S1 bearer, to the radio bearer corresponding to the flow priority assigned to the data flow.
  • a second feature of the present invention is summarized as a mobile station including: a bearer management unit configured to manage flow priorities assigned to data flows to be transmitted to a radio base station via radio bearers; and a priority control unit configured to perform priority control over the data flows to be transmitted to the radio base station via the radio bearers.
  • the bearer management unit establishes a radio bearer with the radio base station for each of the flow priorities, and the priority control unit transfers each data flow to the radio bearer corresponding to the flow priority assigned to the data flow, the data flow being to be transmitted to the radio base station via the corresponding radio bearer.
  • a third feature of the present invention is summarized as a radio base station including a priority control unit configured to perform priority control in a PDCP layer over a data flow received from a core network device.
  • the priority control unit manages a flow priority assigned to the data flow received from the core network device and a priority in the PDCP layer in association with each other, and the priority control unit performs priority control over the data flow received from the core network device, based on the priority in the PDCP layer that is associated with the flow priority assigned to the data flow.
  • a fourth feature of the present invention is summarized as a mobile station including a priority control unit configured to perform priority control in a PDCP layer over a data flow to be transmitted to a radio base station.
  • the priority control unit performs priority control over the data flow to be transmitted to the radio base station, based on a priority in the PDCP layer that is associated with a flow priority assigned to the data flow.
  • a fifth feature of the present invention is summarized as a mobile station including a transmission unit configured to notify a radio base station eNB of a capability regarding a flow priority assigned to a data flow.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of a radio base station eNB according to the first embodiment of the present invention.
  • FIG. 3 is a functional block diagram of a mobile station UE according to the first embodiment of the present invention.
  • FIG. 4 is a sequence diagram for explaining an operation of the mobile communication system according to the first embodiment of the present invention.
  • FIG. 5 is an overall configuration diagram of a mobile communication system according to a second embodiment of the present invention.
  • FIG. 6 is a flowchart for explaining operations of a radio base station and a mobile station according to the second embodiment of the present invention.
  • FIG. 7 is a diagram for explaining conventional technology.
  • FIG. 8 is a diagram for explaining conventional technology.
  • a mobile communication system according to a first embodiment of the present invention is described with reference to FIGS. 1 to 4 .
  • the mobile communication system includes a core network device P-GW, a core network device S-GW, a radio base station eNB, and a mobile station UE.
  • S1 bearers are established for respective QCIs, and radio bearers are respectively established for FPIs #X to #Z which are assigned to data flows that can be transmitted via the S1 bearer of the same QCI.
  • each EPS bearer includes multiple radio bearers, one S1 bearer, and one S5/S8 bearer.
  • each E-RAB includes multiple radio bearers and one S1 bearer.
  • each radio bearer is established between the mobile station UE and the radio base station eNB
  • each S1 bearer is established between the radio base station eNB and the core network device S-GW
  • each S5/S8 bearer is established between the core network device S-GW and the core network device P-GW.
  • the radio base station eNB includes a reception unit 11 , a bearer management unit 12 , a priority control unit 13 , and a transmission unit 14 .
  • the reception unit 11 is configured to receive various signals from the mobile station UE and the core network device S-GW.
  • the bearer management unit 12 is configured to manage the radio bearers and S1 bearers described above.
  • the bearer management unit 12 manages QCIs that are assigned to respective S1 bearers and FPIs that are assigned to respective data flows received from the core network device S-GW via each S1 bearer.
  • the bearer management unit 12 also establishes S1 bearers for respective QCIs with the core network device S-GW and establishes one or more radio bearers for respective FPIs with the mobile station UE.
  • the priority control unit 13 is configured to perform priority control over data flows received from the core network device S-GW via an S1 bearer.
  • the priority control unit 13 transfers data flows received from the core network device S-GW via an S1 bearer, to radio bearers for the FPIs assigned to the data flows.
  • the transmission unit 14 is configured to transmit various signals to the mobile station UE and the core network device S-GW.
  • the transmission unit 14 sends the mobile station UE data flows transferred by the priority control unit 13 via radio bearers.
  • the mobile station UE includes a bearer management unit 21 , a priority control unit 22 , and a transmission unit 23 .
  • the bearer management unit 21 is configured to manage the radio bearers described above.
  • the bearer management unit 21 manages FPIs that are assigned to data flows to be transmitted to the radio base station eNB via the respective radio bearers.
  • the bearer management unit 21 also establishes radio bearers for respective FPIs with the radio base station eNB.
  • the priority control unit 22 is configured to perform priority control over data flows to be transmitted to the radio base station eNB via respective radio bearers.
  • the priority control unit 22 transfers data flows to be transmitted to the radio base station eNB via radio bearers, to radio bearers for the FPIs assigned to the data flows.
  • the transmission unit 23 is configured to transmit various signals to the radio base station eNB and the core network device S-GW.
  • the transmission unit 23 sends the radio base station eNB data flows transferred by the priority control unit 22 via radio bearers.
  • the radio base station eNB upon detecting a new radio bearer establishment trigger (or a change of FPI for an existing radio bearer) in Step S 1000 , the radio base station eNB sends the mobile station UE a “RRC connection reconfiguration” for notification of the FPI in Step S 1001 .
  • the mobile station UE establishes a radio bearer for the FPI (or changes the FPI for the existing radio bearer) in response to the “RRC connection reconfiguration,” and sends the radio base station eNB a “RRC connection reconfiguration complete” in Step S 1002 .
  • Step S 1003 the radio base station eNB and the mobile station UE perform priority control using the FPI.
  • a mobile communication system according to a second embodiment of the present invention is described in terms of differences from the mobile communication system according to the first embodiment described above.
  • S1 bearers and radio bearers are established for respective QCIs as in the bearer configuration of existing mobile communication systems.
  • the priority control unit 13 is configured to manage “FPIs” in association with “DFPs (Data Flow Priorities).”
  • the “FPIs” are notified in “GTP-u headers” from a core network (mobile management node MME).
  • the priority control unit 13 is also configured to perform priority control in the PDCP layer over data flows received from the core network device S-GW.
  • the priority control unit 13 performs priority control over data flows received from the core network device, based on DFPs associated with FPIs #X to #Z assigned to the data flows.
  • the priority control unit 13 preferentially transmits a data flow given a smaller DFP value to the RLC (Radio Link Control) layer (or transforms it into a PDCP-PDU) in the PDCP layer.
  • RLC Radio Link Control
  • the priority control unit 13 may perform priority control over data flows assigned no FPIs, based on default DFPs.
  • the priority control unit 13 also performs priority control using existing QCIs in the MAC layer.
  • the transmission unit 14 may be configured to notify the mobile station UE of information associating FPIs with DFPs.
  • the priority control unit 22 is configured to perform priority control in the PDCP layer over data flows to be transmitted to the radio base station eNB.
  • the priority control unit 22 performs priority control over data flows to be transmitted to the radio base station eNB, based on DFPs associated with FPIs #X to #Z assigned to the data flows.
  • the priority control unit 22 may perform priority control over data flows assigned no FPIs, based on default DFPs.
  • the radio base station eNB and the mobile station UE judge whether or not the setting according to DFP-based priority control is made, i.e., whether or not DFPs for respective FPIs are set.
  • Step S 102 If “YES,” the operation advances to Step S 102 . If “NO,” the operation is terminated.
  • Step S 102 the radio base station eNB and the mobile station UE perform priority control in the PDCP layer over data flows to be transmitted, based on DFPs associated with FPIs #X to #Z assigned to the data flows.
  • the radio base station eNB and the mobile station UE preferentially transmits a data flow given a smaller DFP value to the RLC layer (or transforms it into a PDCP-PDU) in the PDCP layer.
  • a discard timer may be prepared for each FPI in addition to that timer. This enables data to be discarded based on more detailed priorities.
  • the mobile station UE which can be equipped with only a small amount of memory is assumed to have restrictions on the number of DFPs that the UE can set simultaneously.
  • the transmission unit 23 is configured to notify the radio base station eNB of the UE's capabilities regarding DFPs.
  • the transmission unit 23 may use a “UE Capability” to provide notification of the capabilities regarding DFPs.
  • the transmission unit 23 may provide notification of the number of DFPs settable in the mobile station UE, or the number of DFPs settable for each radio bearer.
  • the radio base station eNB may be configured to decide the maximum number of DFPs to be set in each radio bearer according to the capabilities regarding DFPs. In this case, the radio base station eNB transmits the maximum number thus decided to the mobile station UE, so that the mobile station UE can perform appropriate memory management.
  • a first feature of the present embodiment is summarized as a radio base station eNB including: a bearer management unit 12 configured to manage FPIs (flow priorities) assigned to data flows received from a core network device S-GW via an S1 bearer; and a priority control unit 13 configured to perform priority control over the data flows received from the core network device S-GW via the S1 bearer.
  • the bearer management unit 12 establishes a radio bearer with a mobile station UE for each of the FPIs, and the priority control unit 13 transfers each data flow received from the core network device S-GW via the S1 bearer, to the radio bearer corresponding to the FPI assigned to the data flow.
  • the radio base station eNB transfers data flows received from the core network device S-GW via an S1 bearer to radio bearers for the FPIs assigned to the data flows, so that priority control using FPIs can be realized.
  • a second feature of the present embodiment is summarized as a mobile station UE including: a bearer management unit 21 configured to manage FPIs assigned to data flows to be transmitted to a radio base station eNB via radio bearers; and a priority control unit 22 configured to perform priority control over the data flows to be transmitted to the radio base station eNB via the radio bearers.
  • the bearer management unit 21 establishes a radio bearer with the radio base station eNB for each of the FPIs, and the priority control unit 22 transfers each data flow to the radio bearer corresponding to the FPI assigned to the data flow, the data flow being to be transmitted to the radio base station eNB via the corresponding radio bearer.
  • the mobile station UE transfers data flows to be transmitted to the radio base station eNB via radio bearers to radio bearers for the FPIs assigned to the data flows, so that priority control using FPIs can be realized.
  • a third feature of the present embodiment is summarized as a radio base station eNB including a priority control unit 13 configured to perform priority control in a PDCP layer over a data flow received from a core network device S-GW.
  • the priority control unit 13 manages a FPI and a DFP (priority in the PDCP layer) in association with each other, and the priority control unit 13 performs priority control over the data flow received from the core network device, based on the DFP that is associated with the FPI assigned to the data flow.
  • the radio base station eNB performs priority control in the PDCP layer based on DFPs corresponding to FPIs, so that priority control using FPIs can be realized.
  • the priority control unit 13 may perform priority control over a data flow not assigned the FPI, based on a default DFP (predefined priority in the PDCP layer).
  • the radio base station eNB can perform priority control appropriately also over data flows assigned no FPIs.
  • the radio base station eNB may further include a transmission unit 14 configured to notify a mobile station UE of information associating the FPI and the DFP with each other.
  • a fourth feature of the present embodiment is summarized as a mobile station UE including a priority control unit 22 configured to perform priority control in a PDCP layer over a data flow to be transmitted to a radio base station eNB.
  • the priority control unit 22 performs priority control over the data flow to be transmitted to the radio base station eNB, based on a DFP that is associated with a FPI assigned to the data flow.
  • the mobile station UE performs priority control in the PDCP layer based on DFPs corresponding to FPIs, so that priority control using FPIs can be realized.
  • the priority control unit 22 may perform priority control over a data flow not assigned the FPI, based on a default DFP.
  • the mobile station UE can perform priority control appropriately also over data flows assigned no FPIs.
  • a fifth feature of the present embodiment is summarized as a mobile station UE including a transmission unit 23 configured to notify a radio base station eNB of a capability regarding DFP (capability regarding a FPI assigned to a data flow).
  • the capability regarding the FPI may indicate any one of the number of DFPs settable in a mobile station UE and the number of DFPs settable for each radio bearer.
  • the foregoing operations of the mobile stations UE, the radio base station eNB, and the core network devices S-GW/P-GW may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented in combination of the two.
  • the software module may be provided in a storage medium in any format, such as a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM), a register, a hard disk, a removable disk, or a CD-ROM.
  • RAM Random Access Memory
  • flash memory a ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable ROM
  • register a hard disk, a removable disk, or a CD-ROM.
  • the storage medium is connected to a processor so that the processor can read and write information from and to the storage medium.
  • the storage medium may be integrated in a processor.
  • the storage medium and the processor may be provided inside an ASIC.
  • Such an ASIC may be provided in the mobile stations UE, the radio base station eNB, and the core network devices S-GW/P-GW. Otherwise, the storage medium and the processor may be provided as discrete components inside the mobile stations UE, the radio base station eNB, and the core network devices S-GW/P-GW.
  • the present invention can provide a radio base station and a mobile station which can perform priority control using FPIs.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)
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US20160050682A1 (en) 2016-02-18
EP2983443A1 (de) 2016-02-10
JP6227881B2 (ja) 2017-11-08
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EP2983443B1 (de) 2019-06-19
US10893530B2 (en) 2021-01-12

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